Unfortunately, the body was already disposed of. I feel like we might be onto something here. We may never know for sure, but the diagnosis does make sense.
I would still cut out the corn. Its not good for them, and its very high in fat. 2 cups is also twice as much as you should be feeding. Each bird should only have 1tbsp per day. Thats 21 tbsp for the whole flock, which rounds down to 1 cup of corn per day max.
I think there is a very good chance...
I think we may have found your issue. How many birds are you feeding that corn? I would cut that, and the flock block out. flock blocks are very high ins sugar, since you need the sugar to get it to stick together. Along with all the seeds in it, which have very little nutritional value.
Can...
Do you feed many treats? What feed do you feed?
Fatty liver disease is a common reason for, "sudden death", maybe thats what we're experiencing here. Especially since she was heavy.
I'm so sorry for your loss. I do agree that pineapple was not the issue here.
Do you still have her body? The only way to know what happened would be to send her in for a necropsy at your state lab, or do one yourself. You would like to send her in, than keep her body cold but not frozen.
I'm...